I've got the Fast 5688W for home internet. It's completely unconfigurable except for the SSID and password. I was able to get my VPN working by using a separate router. I thought I might have issues because I can't turn the T-Mobile HotSpot off however so far so good. Jitter might be a little high.... But speeds are good and back to normal.
My company also uses the Cisco VPN, and I’m seeing the same issue here that everyone else has described. I have the newer FAST 5688W modem which has almost zero configuration. I have IPv6 off, MTU set at 1280, I’ve reset the modem and seen zero improvement. The only additional information I’d add is I experienced the same issues with Starlink, but not until recently… so maybe it is the Cisco VPN? I have zero options to adjust any settings on AnyConnect, all locked down.
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